I've discussed the above with Fiona now and the bivi bag I have here is probably too good for what she wants to use one for. In case anyone else wants one, it's as new, with an optional small hooped pole at shoulder level (i.e. for really lightweight trips you leave the pole behind). It's plain green (not army camo) and I'll sell it for ?50, which is a LOT less than I paid for it. If interested, just PM me to sort out getting it to you.